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      <Title language="en">Expression and therapeutic potential of TROP-2 in Cisplatin-resistant non-seminomatous germ cell tumors</Title>
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          <Affiliation>STRATIFYER molekularpathologisches Institut GmbH, K&#246;ln, Deutschland</Affiliation>
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          <Affiliation>Uniklinik K&#246;ln, Abteilung f&#252;r Urologie, Uro-Onkologie, spezielle urologische und roboter-assistierte Chirurgie, K&#246;ln, Deutschland</Affiliation>
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          <Corporatename>German Medical Science GMS Publishing House</Corporatename>
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        <Address>D&#252;sseldorf</Address>
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      <SubjectheadingDDB>610</SubjectheadingDDB>
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      <DatePublished>20250402</DatePublished>
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    <Language>engl</Language>
    <License license-type="open-access" xlink:href="http://creativecommons.org/licenses/by/4.0/">
      <AltText language="en">This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 License.</AltText>
      <AltText language="de">Dieser Artikel ist ein Open-Access-Artikel und steht unter den Lizenzbedingungen der Creative Commons Attribution 4.0 License (Namensnennung).</AltText>
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        <MeetingId>M0609</MeetingId>
        <MeetingSequence>24</MeetingSequence>
        <MeetingCorporation>Nordrhein-Westf&#228;lische Gesellschaft f&#252;r Urologie e.V.</MeetingCorporation>
        <MeetingName>70. Kongress der Nordrhein-Westf&#228;lischen Gesellschaft f&#252;r Urologie</MeetingName>
        <MeetingTitle></MeetingTitle>
        <MeetingSession>Uroonkologie</MeetingSession>
        <MeetingCity>M&#252;nster</MeetingCity>
        <MeetingDate>
          <DateFrom>20250403</DateFrom>
          <DateTo>20250404</DateTo>
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    <ArticleNo>V 1.24</ArticleNo>
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      <MainHeadline>Text</MainHeadline><Pgraph><Mark1>Background:</Mark1> Cisplatin-based chemotherapy has been the standard of care for metastatic germ cell tumors (mGCT) for the past four decades due to its high efficacy. However, cisplatin-refractory patients have a poor prognosis due to limited treatment options. Therefore, there is an unmet need for effective therapies for these patients, such as antibody-drug conjugates (ADCs), which have shown significant clinical efficacy in metastatic solid tumors. Our objective was to evaluate the expression of TROP-2 in cisplatin-resistant non-seminomatous GCT (NSGCT) metastases &#91;MET(-R)&#93; and to assess the cytotoxic efficacy of the anti-TROP-2 ADC Sacituzumab govitecan (SG) in NSGCT cell lines.</Pgraph><Pgraph><Mark1>Methods:</Mark1> TROP-2 mRNA and protein levels were measured using qRT-PCR and immunohistochemistry with H-score evaluation in MET(-R), including embryonal carcinoma (EC), choriocarcinoma (CC), yolk sac tumor (YST) and teratoma (TER).<Mark2> In vitro</Mark2> analyses included Western Blot and cell viability assay were performed in GCT cell lines, including cisplatin-resistant subclones (-R) derived from EC (NCCIT, 2102EP), CC (JAR, JEG-3, BeWo), and an EC-YST-intermediate (1411H), to assess the cytotoxic efficacy of the anti-TROP-2 ADC SG.</Pgraph><Pgraph><Mark1>Results:</Mark1> We demonstrated that TROP-2 mRNA levels were significantly increased in CC and TER-MET(-R) compared to EC and YST-MET(-R) (p&#60;0.01). Immunohistochemical staining revealed moderate to strong membranous TROP-2 expression in 100&#37; of CC-MET(-R) &#91;n&#61;4&#47;4, with H-score &#8805; 100, median H-score 250 (IQR 187.5&#8211;290)&#93; and in 88.9&#37; of TER-MET(-R) cases &#91;median H-score 255 (IQR 200&#8211;265)&#93;, while TROP-2 was absent or weak in patients with EC &#91;median H-score 22.5 (IQR 5&#8211;73.75)&#93;, and YST &#91;median H-score 0 (IQR 0&#8211;12.5)&#93; cases (p&#60;0.01). <Mark2>In vitro</Mark2> analyses indicated that the efficacy of SG depended on the extent of TROP-2 expression (p&#60;0.01).</Pgraph><Pgraph><Mark1>Conclusion:</Mark1> In summary, we identified TROP-2 as a potential therapeutic target for a subset of patients with cisplatin-refractory NSGCT and highlighted the potential benefit of TROP-2-directed ADCs, such as SG, for TROP-2-positive mGCT patients.</Pgraph></TextBlock>
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